Test problem 1 using values of month from 1-15.

Test problems 2, 3, and 10 with the file test.dat.
For problem 2, you need to use a command like the
following (assuming your executable is named prob2):

    prob2 < test.dat

The < says use the file as the standard input
instead of using input from the screen.

Test problem 5 with the following values: -10, 0,
5, 10 and 100.